The order of the constituents adjective and substantive in the Catalan language: a diachronical analysis. In face of the quantitative analysis of sintagma nominal (SN) of the Catalan language, giving relevance to the relations between the constituents adjective and substantive and, through a corpus composed of texts dated in the XIII, XIV, XV and XX centuries. I evidenced the change of word order of the constituents A (adjetive) and N (substantive), to AN > NA; in other words, the old order, anteposition of A to N, gives place to a most recent form, the posposition of A in relation to N. I verified that certain inherent semantic features act as determinative factors of the order of these constituents, the adjectives and substantives. (Portuguese text).